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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Construction of allitol synthesis pathway by multi-enzyme coexpression in Escherichia coli and its application in allitol production.
An engineered strain for the conversion of D-fructose to allitol was developed by constructing a multi-enzyme coupling pathway and cofactor recycling system in Escherichia coli. D-Psicose-3-epimerase from Ruminococcus sp. and ribitol dehydrogenase from Klebsiella oxytoca were coexpressed to form the multi-enzyme coupling pathway for allitol production. The cofactor recycling system was constructed using the formate dehydrogenase gene from Candida methylica for continuous NADH supply. The recombinant strain produced 10.62 g/l allitol from 100 mM D-fructose. To increase the intracellular concentration of the substrate, the glucose/fructose facilitator gene from Zymomonas mobilis was incorporated into the engineered strain. The results showed that the allitol yield was enhanced significantly to 16.53 g/l with a conversion rate of 92 %. Through optimizing conversion conditions, allitol was produced effectively on a large scale by the whole-cell biotransformation system; the yield reached 48.62 g/l when 500 mM D-fructose was used as the substrate.
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